Process of manufacturing pipes.



Patented Nov. 6,

A. SCHMITZ.

PROCESS OF MANUFACTURING PIPES.

(Application filed my 18, 1900.)

(No Model.)

7 [1mm for: Alb r1 .flckm/ilx.

Aiiorzgey' UNITED STATES PATENT OFFICE.

ALBERT SCHMITZ, OF DUSSELDORF, GERMANY.

PROCESS OF MANUFACTURING PIPES.

SPECIFICATION forming part of Letters Patent No. 661,109, dated November 6, 1900.

(No model.)

To all whom it may concern:

Be it known that I, ALBERT SCHMITZ, engineer, a citizen of the Kingdom of Prussia, and a resident of Dusseldorf, Germany, (whose post-oflice address is Palmenstrasse 11,) have invented certain new and useful Improvements in Processes of Manufacturing Pipes, of which the following is a specification.

My invention relates to a new and improved process for manufacturing pipes with longitudinal partitions, these pipes having been made up to this time by inserting flat iron or cross-bars or the like into a ready-made tube and welding them together.

The method of manufacturing describe hereinafter is shown in the accompanying drawings.

Figure 1 shows the operation'of drawing seen from above. Figs. 2 to 5 show crosscuts of some of the materials used in the. process and of the tubes resulting therefrom.

A flat iron or, Figs. 1 and 2, is placed on edgeupon a strip b of sheet metal and both are then drawn through a funnel or die 0, the

edges d of the strip b meeting and forming a tube, embracing the flat iron (1. The edges of the latter are welded at the same time to the tube thus formed, and by subsequent rolling may be further united with the inner side of the tube. A tube is thus formed having two longitudinal canals f and g, the flat iron serving as an air-tight partition-wall separating these two canals.

In Figs. 3 to o are shown further applications of this process, sheet-metal strips y being drawn to form tubes around T-irons m,

Fig. 3, star-irons as, Fig. 4, or cross-bars 06 Fig. 5, thus creating tubes with three or four canals 2.

Besides those irons or bars mentioned above any other sort of profiled iron may be used to form the-partitions.

The drawing may be done in a cold or heated state and may be followed by subsequent rollin The flat or profiled irons or bars may be twisted longitudinally before being placed upon the sheet-iron strip, thus after being drawn through the die inclosing spiral canals between themselves and the wall of the tube.

Having thus described the nature of my invention and how the same is to be performed, what I claim is 1. The'process of manufacturing pipes with longitudinal partitions, which consists in placing a profiled bar upon a sheet-metal strip and simultaneously drawing both through a die, thereby causing the strip to 

